Steam-boiler furnace



April 16, 1929. Anew STEAM BOILER FUR) IAOE '2 Sheets-Sheet l Fil ed July 26, 927

' INVENTOR I Vay ATTORNEY A. McvAY swam aoman FURNACE April 16, 1929.

Filed July 26, 1927 2 Sheets-Sheet 2 ATTORNEY A EXANDER McVAY, or

PAjrEnro FIFICE.

smr'rLn, WASHINGTON.

.STEAMJOILER FURNACE.

Application filed July 26, 1927. Serial No. 208,488.

This invention relates to furnaces for steam boilers, and its object, enerally, is the rovision of animproved furnace of this aracter which is peculiarly adapted to the use of liquid-pr gaseous fuel.

Another object of the invention is the provision of a furnace equipped with devices whereby the combustion of the fuel is substantially completed within the furnace.

More specific objects and advantages of the invention will appear in the following description.

The invention consists in the novel construction, adaptation and combination of devices hereinafter described and claimed.

In the accompanying drawings,-

Figure 1 is a longitudinal vertical sectional View of a boiler setting embodying my improved furnace applied to a steam iler which is shown in side elevation; and Fi s. 2, 3 and 4 are sectional views taken on lines 22, 33 and 4-4 of Fig. 1.

In said drawings the reference numeral 5 represents a horizontal tubular boiler which is shown supported upon the front wall 6 and a baflle wall 7 positioned near the rear wall 8 of the furnace. The spaces 9 and 10 to the front and rear, respectively, of the baffle wall 7 constitute combustion chambers, of which the rear chamber 10' communicates from near its top with the rear ends of the boiler tubes 11 Fig. 3) whose front ends communicate wit a stack or' chimney connection 12. I

Intermediate its length the forward combustion chamber 9 is provided with. a bridge wall 13, and in front thereof isa floor 14 separating the furnace proper from an air receivin chamber 15. The floor 14 is com ose-d o brick, or an equivalent, shown as aid upon supporting-bars 16, and is provided with air passages17.

Above and below the elevation of said floor, the front wall 6 is formed to provide 5 openings 18 and 19, respectively, and are provided with doors 18 and 19 A third opening is rovided above the openin 18 in the wall 6 y the provision therein 0 a tube 20 having an air controlling damper 21 at its outer end. 22 represents a nozzle extending axially into the tube 20 and through which fuel is delivered into the furnace from a pipe 22 leading from a source of fuel supply, not shown.

.23 represents an arch forming the roof of a compartment 24 whose front wall is pro- 'receivlng chamber 15, an -bustionair isadmitted rearwardly into the upper portionof the compartment 24 by air vided by the bridge wall 13. The compartment 24 communicates from'its lower portion through ways 25, afforded b longitudinally disposed tiling 25 (Fig. 3 with tunnels 26 which open into the lower portion of the rear combustion chamber 10.

27 represents a cribriform construction extending between the side walls 28 of the furnace and from a relatively short distance below the boiler 5 to the top of said tunnels 26 and above the ways 25. The structure'27, moreover, extends from the compartment wall 23 to within a short distance of the. baflle wall 7so as to afford a space 29 directly in front thereof.

The cribriform structure 27 above referred to is composed of alternate layers of longitudinally and transversely arranged brick, the brick of each la er being spaced to provide parallel aligne channels which commu-' nic'ate with the channels rectangular thereto of the courses next above and below the same.

The longitudinal channels of the structure 27 which are above the arch wall 23 afford communication between the combustion space at the front of the furnace with the space 29, and similarly communication is had through the lower longitudinal chambers between such space 29 and the upper portion of the compartment 24 and also through the medium of the ways 25 with the front ends of said tunnels. Primary air for combustion purposes is admitted throu h the tube 20 and secondary comconduits30 (Figs land 2). extending upwardly through the bridge wall 13 from supplyconduits as 31 and 32 provided in the furnace walls from outside atmosphere.

' The purpose of thus embeddingthe conduits in the furnace walls is to heat the sec-' ondary air prior to its admission into the furnace.

In action the fuel accompanied by air is injected in an inflammable condition from the burner (22-20) into the front portion of" the furnace. The rimary combustion which occurs above the cor 14 is promoted by the admission of a regulated quantityv of air through floor openings 17 from the chamber 15; The burning fuel, in the form of flames or otherwise, is passed over the cellular structure 27 and through the channels thereof 11 into the chamber 29 in front of the bafile wall 7, whence it is caused to pass forwardly and downwardly through the channels of the structure 27 into" he tunnels 26 either direct ly through the wa s 25, or through the latter and the compartment 24. From said tunnels the flames and unconsumed gases reach the chamber -10, wherein the combustion is completed. With the exception of suchportion of the boiler 5 as is exposed within the furnace, the surfaces with which the comthe bridge wall 13,and in thus traveling to bustible ases and flames come into contact are of buck, or an equivalent, which under normal conditions are maintained at a temperature above that requisite for the combustion of the fuel. The flow ofthe combustion products through the furnace is reversed first by the baflle wall 7 and then by.

the tunnels all of the fuel gases must pass one or more times through the channels of the hot cribriform structure, being divided therein into numerous currents.

The arrangement of the ducts,-etc., for the.

admission of air for combustion, is such that the air enters the furnace in a preheated state. 7

The invention will, it is thought, be under; stood from the foregoing description.

What I claim is 2-- 1 1. In a steam-boiler furnace, in combination, a bafile wall dividing the furnace to provide a front combustion chamberand a rear combustion chamber, a bridge wall in said front chamber, a compartment at the rear of the bridge wall, said compartment having a roof separating the compartment from direct communication with the space thererearwardly directed opening into said compartment.

3. In a steam-bo1ler furnace, 1n combination, a furnace provided with front and rear combustion chambers separated by a baflie wall and communicating with each other;

through openings provided in the lowerportion of said Wall, a bridge wall provided in the front combustion chamber, said bridge wall constituting the front wall of a compartmenthaving communication from its lower portion with the openings of the baflie wall, a fuelsburncr extending into the front portion of the front combustion chamber, means provided to the rear of the bridge wall for conducting gases from the burner'in a pluralityof streams to said wall openings direct lyand also through the-medium'of the compartment, and air-passages extending into said bridge wall and openinginto said compartment.

Signed at Seattle, Washington, this 29th day of June, 1927. ALEXANDER MoVAY. 

